/**
 * @file hello.cpp
 * @author lestoryc 3200103385
 * @date 10-11-2022
 * @brief print the sentence "Hello World!"
 */
#include<iostream>
using namespace std;

/**
 * @brief the main function.
 * @return whether the program runs successfully.
 * @retval 0 success
 */
int main()
{
    cout << "Hello World!" << endl;
    return 0;
}